Batter mixer scraping mechanism



Oct. 31, 1939. T. sEYBER'rv 2.178.269

y BATR MIXER SCRAPING MECHANISM.

Filed Jn. 23, 1939 4-Sheets-Sheot 1 W fiar/zaga Oct. 31, 1939. T."sEYBl-:R'r 2.178.269

BATTER MIXER scmuma MEcmmlsM v Filed Jan. 25, 1939 asume-sheet 2 n 3*"lV/1 Pf6 III' Oct. 3,1, 14939. l y T, sEYBER-r 2.178.269

BATTER MIXER SCRAPING MECHANISM Oct. 3l, 1939. 1*.sEYERT 2178.269 BATTRMIXER SCRAPING MECHANISM Filed Jan, 2s, 1939 4 sheets-sunt 4 PatentedOct. 31, 1939 UNITED STATES PATENT yOFFICE 21 Claims.

-This invention relates to improvements in a scraping mechanis for abatter mixer, and vthe principal object o the invention resides in theprovision Aof mechanism including scraping mem- 5, bers which areadapted to be extended er protruded beyond the normal edge of the mixeror lbeater and brought into direct contact with the inner surface of thebatter o r dough containing receptacle for periodically scraping andremoving ll the accumulated batter which adheres to the inner surface ofthe container.

The mechanism is especially adapted for use in I conjunction with a4mechanical'batter mixer incorporating a rapidly rotating stirrer orbeater tofore been provided a slight clearance between the peripheraledge of the mixer or beater and the inner surface of the bowl orreceptacle. This has resulted in the formation of a thin layer ofbatter, for example, equal in thickness to this clearance, upon theinner surface of the container. This layer of batter, as in mixing abatter for cake, pastry or the like, has been manually removed at statedintervals, by stopping themachine and scraping the inner surface with aknife uneven mixture and the batter is lumpy. An im- -portant object ofthe present invention. is the provision of improved mechanism wherebythis v scraping operation may be performed in a thorough and eflclentmannerwithout the necessity of stopping the machine. Thus not only is amore uniform and superior batter produced, but

the loss of time and inconvenience of the manual 'scraping are overcome.

An addiunai object is the incorporation of 50 of the improved mixingmember wherein the scraping shoes are in retracted position andconcealed within 'the frame of the mixer:

Fig.v 2 is a vertical sectional view ,showing the interior constructionadjacent the shoe or scrap- 55 ing member mounted upon the leftlioriiiontal and in devices of this character, there has hereor similarutensil. If this is not done, there is an radial rod as shown in Fig. 1,for example, with the scraping shoe in extended position and in contactwith the bowl inner surface;

Fig. 3 is a vertical sectional view to more clearly illustrate the innerconstruction of the preferred 5 form of the invention, takensubstantially on the line 3-3 of Fig. 4;

Fig. 4 is a transverse sectional'view, partly in elevation, takensubstantially on the line H of Fig. 3: y l0 Fig. 5 is a detallview ofthe lower operating mechanism shown in Fig. 3 for engagement with theangular radial rods;

Fig. 6 is a view similar to Fig. 5 showing a modied form ofconstructionfor operating the lower angular push rods;

Fig. 7 is a horizontal sectional view, taken substantially on the line'|-1,of Fig. 6;

Fig. 8 is a view, similar to Fig. 3, but showinga modified form ofconstruction and also showing the scraping elements in extendedposition;

Fig. 9 is a detail view with the cover plate applied, but partly brokenaway, showing the lowermost shoe or scraping member in retractedposition;

Fig. l0 is a vertical sectionalview showing the .scraping member mountedupon the right horizontal radial rod as shown in Fig. 8, with thescraping member shown in retracted position;

Fig. 11 isa vertical sectional view taken substantially on the lineH--ll of Fig. 8;. l

Fig. 12 is an' enlarged detail view, partly in section, showing theoperating mechanism, and l taken substantially on the line ll-IZ ofFig.. 8;

Fig. 13 is an enlarged detail view, partly in section, takensubstantially on the line I3-I3 of F18. 8:

Fig. 14 is an enlarged detail elevational view of the operatingmechanism and showing the positions assumed by the parts when thescraping members are in retracted position; and

Fig. 15 is a detail view, taken substantially on the line IB-IS of Fig.8. showing theA preferred dovetail arrangement of the meeting ends ofcontiguous shoe members. s Y

The invention resides principally in an improved mixer or beater member,and a complete operative device is vshown in Fig. l; to illustrate thecomplete combination. Referring to this ngure of a preferred embodiment,an electric motor housing 201s mounted upon a stand '2l supported bybase 22. A bowl supporting bracket 23 is adapted to embrace a portion ofthe batterf containing bowl or receptacle and is mounted upon .a bracketsupport 24 arranged for vertical move- 55 ysupplied through wires 32.

A transmission housing 33 has enclosed therein "a central shaft andsuitable gearing for driving Vduring the scraping operation.

the offset shaft hub 34 at a high rate of speed. This gearing is alsoconstructed and arranged to cause the shaft hub 34 to revolve around themain enclosed drive'shaft while being rotated at a relatively highspeed. The shaft hub 34 has mounted therein a mixer drive shaft 33provided with laterally extending pins 33.

The mixing bowl or receptacle 31, in the present illustrativeembodiment, has an upper cylindrical portion 33, a central elevation 33at the" bottom, an annular curved portion 43 on one radius and a' sideannular curved portion 4| on a second radius. Mounted upon the side ofbowl 31 is a supporting knob 42 adapted to be in-y serted in an openingin bracket support 24 and mounted on the exterior of bowl 31 are a pairof handles 43, as shown in Fig. 3, the under sides of which are socketedto fit over pins on the bracket arms 23. a

The mixer 44 is provided with an upper central shank 45 bored to providea socket 43 for receiving shaft 35 and having a bayonet slot 41 forengagementrby pins 33. -The main central body po'rtion 43 of the mixerhas upper lateral extending arms 49, rigidly connectingI the centralbody portion with the operating portion.` Centrally disposed are a pairof horizontal radial hollow or tubular arms 33 and 3| and a pair ofangularly disposed radial arms 32.and 33, as well as averticalconnecting arm 34 shown as constituting the lower portion of the bodyD01'- tion 48. These arms terminate in an outward connecting rim 33.

Referring to Figs. 3 and 4, there is provided in the rim 33l aperipheral reces's 33 within which the scraping shoes. hereinafterdescribed are adapted to be moved into a retracted position duringnormal operation and extended position AdJacent the outer extremity ofeach of the lateral f lve arms mentioned, the rim 33 has transversepockets 31 to accommodate the operative connections between the shoes orscraping members and con-- nected parts as prently described. Each ofthese arms has an enlarged spring recess 33 and inner recesses 59.4'I'he body portion 43 is provided with a' central operating chamber 33and the operating arms are also provided with outer bores or recesses 3|for receiving the push rods.

'I'hus the upper push rods 32 are mounted in the horizontal arms 33 and3|, the angular push rods 33 are mounted in angular arms 32 and 33, andthe .vertical push rod 34 is mounted in the vertical connecting arm 34.Each of these push rods carries a collar 33 and a compression spring 33is interposed between thiscollar and the outerl .shoulder formed by therecess 33, thus tending to urge the push rods inwardly or into retractedposition, and the outward end of each push rod hasa flattened portion31.

As clearly shown in Fig. 3, each of the hori- `zontal push rods 32 isconnected to a scraper shoe 33.4 These scraper shoes may be composedarranco of any suitable material such as rubber, bronze or similarmetal. as long as the material is softer than the material of which thebowl is constructed. so :as to avoid ,an abrading action thereon. Whenemploying hard rubber, for ex- A ample,A suitablesupporting ,frames areprovided. Similarly, each angular push rod 33 is provided with a scrapershoe 33, and the vertical push rod 34 is provided with a scraper shoe13. The reason for employing a plurality of scraper shoes isA that thecontour of the inner surface of the mixing bowl as illustrated is notuniform. It will be understood that the design and shape of theperipheral rim as well as of the scraping members is dictated by theshape and contour of the inner surface of the bowl. In the presentembodiment, the outer edges of the shoes 33 are straight, the edges ofshoes 39 are curved on the same radius, and the edge of shoe 13 iscurved on a dierent radius. l

Each of the scraping members is provided with a pairof spaced centrallydisposed ears 1| having slots 12 and adapted to straddle the flattenedextension 31 of the associated push rod. In each such connection a pin13 extends through the flattened portion and the slots permit of slightradial movement. The peripheral rim 33 is preferably provided with aplurality of pockets 14 within which, are inserted extending springs 13to 'producea cushioning effect when the scraping members are,.inextended position. The inner ends of the push rods have threaded thereonbearing members 13 upon which are mounted rollers 11.

In this particular construction, the operating parts are manipulated bymeans of a central operating stem 13 slidably mounted in an upper guideportion 19 and a lower guide portion 33. As shown in Fig. 5, the stem 13has a central bore 3| at its lower en'd and also slots 32. Pin 33,15inserted through the vertical push rod 34 and is adapted to ride in theslots 32, the push rod being urged outwardly by spring 34. Thisarrangement is for the purpose of equalizing the thrust exerted on thepush rods upon depression of stem 13.

Referring again to Figs. 3 and 4, stem 1 3 has mounted thereon a pair ofupper cam arms 33, pivoted at 33 and connected by a turnbuckle 31 foradjusting the angular inclination to vary the extent of thrust upon theassociated push rods 32. Stem 13 also carries a pair of lower cam arms33 pivoted at 39 and connected by turnbuckle 33 for a similar purpose inconnection with push rods"33. The upper end of stem 13 is secured to anoperating block 3| which is movable in recess 32 and pivotally connectedto the inner end of operating lever 33 which is pivoted at 34 to theframe. To maintain the stern 13 normally in its upper position wherebythe push rods are retracted, the upper extremity is provided with a hookmember 33 adapted to be en- Saeed by detent 33 which is forced inwardlyby spring 31. Detent 33 has an outwardly extending releasing arm 93 andthe detent member is pivoted at 93. Mounted adjacent these parts andadapted to bear against block 3| is a compression spring |33 of sumcientstrength to 'overcome combined resistance exerted by springs 33. Fig. -6shows a modifled form of cam element for operating the lateral push rodsand comprises a triangular cam member |3| having slot- |32 for receivingguide pin |33 to permit of vertical adjustment and secured in place byscrew |34 threaded in stem 13. y

In Figs. 8 to 14', inclusive, a modified form of construction is shown.This structure comprises a left horizontal tubular or hollow arm |05, aright horizontal tubular arm |06, a left angular tubular arm |01, aright angular tubular arm |08 and a verticaitubular arm |09. Push rod||0 is mounted for longitudinal movement in ai'mr |00, push'rod issimilarly mounted infar'm |06, push rod I|2 in arm |01, push rod ||3 inarm |08 and the center .push rod IM, which in reality is an elongatedlink. is mounted in arm |09. The inner end of push rod is pivotallyconnected to a bell crank plate H which is pivoted at H6, and at |.|1there is a pivotal con-l at to operating link |20, and bell crank plate|21,`pivoted at |28 is connected at |29 to operat-V -ing members arepreferably dovetailed to avoid spreading or separating when the partsare in extended position. The assembly is completed by plate |34 whichis atta'ched to the main body portion preferably by a plurality ofcounter-sunk screws.

- In operation, the desired amount of batter, for example, is placed inthe bowl 31. The bowl is then elevated to operating position by means ofhandle 20. The motor is started by switch 00 and speed is regulatedthrough the speed control 3|. The mixing frame not only rotates veryrapidly on its own shaft 39, -but shaft 35 describes a circular travel.When it is desiredv to scrape the batter which has adhered to the sidesand bottom of the bowl, the. speed is preferably reduced to low.Thereupon releasing arm 90 is raised, allowing stem 'I0 to be forceddownwardly by spring |00 and causing the scraping members to be broughtinto contact withthe inner sur# face of the bowl. It is not necessary tostop the machine` for this scraping purpose. This operation is allowedto continue for a suillcient length of time to cleanse the inner surfaceof the bowl after which the scraping members are retracted by depressinglever 00 andthe stem 10 isheld in restricted position by detent 98. Thespeed is then increased and normal operation continues. It is onlynecessary to perform the scraping operation at certain intervals toobtain a ooth mixture of uniform consistency. The operation with respectto the structure shown in Fig. 8 is the same inasmuch as the depressingof the lever 93, shown in this ligure, causes all the link connectlonsto be drawn upwardly'and the scraping members retracted. Thecushionsprings 19 cause the shoes or scraping members to yield uponencountering any irregularity in the surface of the bowl and also serveto maintain constant conwith receptacles of different size and shapes,and

also that the invention may be utilized with a flat bottom container aswell as with a ba o r dough mixer of thehoiizontal type.

While I have illustrated and described the preferred form ofconstruction for' carrying my invention into effect, this is capable ofvariation and modication without departing from the spirit of theinvention. I, therefore, do not wish to be limited to the precisedetails of construction set forth, but desire to avail myself of suchvariations and modifications as come within the scope of the appendedclaims. Having thus described my invention, what claim as new and desireto secure by Lettersv Patent, is:

:1. A device of the character described comprising a mixer having aperipheral edge portion, scraping members mounted in said edge portionand restrained on opposite sides, mechanism for extending and retractingsaid scraping members, said mechanism comprising "a plurality kof pushrods connected to said scraping members, a single operating meansengaging said push rods for projecting or `reti-acting the same, andresilient cushioning means members.

2. A device of the characterdescribed comprising a mixing member havinga peripheral edge portion and provided with a plurality o f laterallyextending arms. scraping members mounted end to end .adjacent said edgeportion', longitudinally 25 associated with said scraping y movable pushrods mounted in saidl arms andV operatively connected to said scrapingmembers individually, and operating mechanism engaging said push rods to'spread the push rods for projecting the scraping members.

3. A device of'the character described comprising a mixing member havinga curved peripheral edge portion and provided with a plurality oflaterally extending arms, scraping members mounted adjacent said edgeportion, conned laterally and conforming to said curved edge portion,normally retracted longitudinally movable push rods mounted in said armsand operatively connected to said scraping members,I operating.'

mechanism engaging said push rods for spreading the same to project thescraping members, and

` resilient cushioning means associated with said mechanism operativelyassociated with said push rods, said actuating mechanism comprising acentral operating stein and means for longitudinally shifting said pushrods.

5. A device oi the character described comprising a mixing member havinga peripheral edge portion and provided with a plurality of laterallyvextending scraping members mounted adjacent said edge portion,longitudi- .nally movable push rods mounted in said arms and operativelyconnected to said scraping members, actuating mechanism operativelyassociated with said push rods, said actuating mechanism comprising acentral operating stem, an operating member for longitudinally shiftingsaid push rods, and resilient cushioning means associated with saidscraping members.

6. A device of the character described commisconnected to said scrapingmembers, actuating ing a mixing member having a peripheral edge portionand provided with a plurality of laterally extending arms, scrapingmembers mounted adjacent said edge portion, longitudinally movable pushrods mounted in said arms and operatively connected to said scrapingmembers, operating mechanism engaging said push rods, and actuatingmechanism operatively associated with said operating mechanism, saidoperating mechanism comprising a plurality of link members operativelyconnected to said push rods.

7. A device of the character described comprising a mixing member havinga peripheral edge portion and provided with a plurality of laterallyextending` arms, scraping members mounted adjacent said edge portion,longitudinally movable push rods mounted in said arms and operativelyconnected to said scraping mexm bers, operating mechanism engaging saidpush gq rods, actuating mechanism operatively associated with saidoperating mechanism, said operating mechanism comprising a plurality oflink members operatively connected to said push rods, and resilientcushioning means associated with g5 said scraping members.

8. A device of the character described `comprising a mixing memberhaving a peripheral edge portion and provided with a plurality of lat--erally extending arms, scraping members mounted adjacent said edgeportion, longitudinally movable push rods mounted in said arms andoperatively connected to said scraping members, actuating mechanismoperativelyl associated with said push rods, said actuating mechanismcomg5 prising a central operating stem, a cam member members, 'and acontrol lever for operating said link members.

12. A device oi' the character described comprising a mixing memberhaving a curved peripheral edge' portion with a groove and providedwith` a plurality ot laterally extending arms, scraping members mountedadjacent said edge portion in said groove and following the curvaforlongitudinally shifting said push rods, and aA control lever foroperating said stem.

9. A device of the character described comprising a mixing member havinga peripheral edge 40 portion and provided with a plurality of laterallyextending arms, scraping members mounted adjacent said edge portion,longitudinally movable push rods-mounted in said arms and operativelyconnected to said scraping members, actuating mechanism operativelyassociated with said push rods, said actuating mechanism comprising acentrai operating stem, a cam member for longiy tudinally shifting saidpush rods, resilient cushioning means associated with said scrapingmembers, and a control lever foroperating said stem.

10. A device of the character described comprising a mixing memberhaving a peripheral edge portion and provided with a plurality of lat-`erally extending arms. scraping members mounted adjacent said edgeportion, longitudinallyv movable pushrodsmounted in said arms andoperatively connected to said scraping members, actuating mechanismoperatively associated with said push rods, said actuating mechanismcom- 50 prising a plurality of link members operatively connected tosaid push'rods, and a control lever A for operating said link members.

11. A device of the character described comprising a mixing memberhaving a peripheral g5 edge portion and provided with a plurality oi'laterally extending arms, scraping members mounted adjacent said edgeportion, longitudinally movable push rods mounted in said arms andoperatively connected to said scraping members,

'I0l operating mechanism engaging said push rods,

actuating mechanism operatively associated with saidoperating'mechanism, said operating mechanism comprising a plurality oflink members operatively connected to said push rods, resilient l5cushioning means associated with said scraping ture thereof,longitudinally movable push rods mounted in said arms and operativelyconnected to said scraping membrs, operating mechanism engaging saidpush rods. and spring means tending to urge said push rods intoretracted'position.

13. A device of the character described comprising a mixing memberhaving a peripheral edge portion and provided with a plurality oflaterally extending arms, scraping members mounted adjacent said edgeportion, longitudinally movable push rods mounted in said arms andoperatively connected to said scraping members,

actuating mechanism operatively associated with4 said push rods, saidactuating mechanism comprising a central operating stem, a' cam member'for longitudinally shifting said push rods, and spring means tending tourge said push rods into retracted position.

14. A device of the character described comprising a mixing memberhaving a peripheral' edge portion and provided with a plurality oflaterally extending arms, scraping members mounted adjacent said edgeportion, longitudinally movable push rods mounted in said armsL andoperatively connected to said scraping members, actuating mechanismoperatively associated with .said push rods, said actuating mechanismcomprising a plurality of members operatively connected to said pushrods, and spring means tending to urge said push rods into retractedposition.

15. A-device of the character described comprising a mixing memberhavinga peripheral edge portion and provided with a plurality of laterallyextending arms, mounted adjacent said edge portion,.longitudi nallymovable push. rods mounted in said arms and operatively connected tosaid scraping mematd with said push rods, said actuating mechanismcomprising a central operating stem, a cam ymember or longitudinallyshifting said push rods,

a control lever for operating said stem, and spring means tending tourge said push rods into retracted position.

16. A device of the character described comprising a mixing memberhaving a peripheral edge portion and provided with a plurality-oilaterally extending arms, scraping members 'mounted adjacent said edgeportion, longitudiscraping members 1 bers, actuating, mechanismoperatively associy mixer having a curved rim, shoes disposed end to endmounted in said rim and held on opposite sides, means to normallyretract the shoes and means on the scraper for projecting-theshoesoutwardly o! the rim against the retracting envases 18. A batter mixerscraping mechanism including drive means, said mixer having a curved-rim of substantially parabololdal form; shoes mounted in said rim andheld on opposite sides, resilient means normally retracting the shoes,

means for cushioning said retraction and tending to normally exertoutward thrust on the shoes, and a single operating member forprojecting the shoes against said resilient means.

19t A batter mixer scraping mechanism including drive means, said mixerhaving a curved rim of substantially paraboloidal form, a plurality ofshoes disposed endwise around and mounted in said rim, resilient meansnormally retracting the shoes, means for cushioning said retraction andtending to normally exert outward thrust on the shoes, an operatingmember having means engaging the shoes to simultaneously project thesame and means to hold said operating member in a set position to holdthe shoes retracted or projected.

20. Batter mixer scraping mechanism, including drive means having a hub.a drive shaft, a

mixer including a shank having means to con neet to the shait,va body`'portion having lateral arms and a rim, scraper shoes movable in saidrim, cushioning means to normally retract the shoes within the peripheryof the rim, means to Vwith said push rods, said actuating mechanismcomprising a central operating stem, an operating member forlongitudinally shifting said push S0 rods, land resilient cushioningmeans associated with said scraping members.

THIEODORE SEYBERT.

